angularjs源码1

一、 mixError用来给出错误

function minErr(module, ErrorConstructor) {
  ErrorConstructor = ErrorConstructor || Error;
  return function() {
    var code = arguments[0],
      prefix = '[' + (module ? module + ':' : '') + code + '] ',
      template = arguments[1],
      templateArgs = arguments,

      message, i;

    message = prefix + template.replace(/{d+}/g, function(match) {
      var index = +match.slice(1, -1), arg;

      if (index + 2 < templateArgs.length) {
        return toDebugString(templateArgs[index + 2]);
      }
      return match;
    });

    message = message + '
http://errors.angularjs.org/1.3.9-local+sha.a3c3bf3/' +
      (module ? module + '/' : '') + code;
    for (i = 2; i < arguments.length; i++) {
      message = message + (i == 2 ? '?' : '&') + 'p' + (i - 2) + '=' +
        encodeURIComponent(toDebugString(arguments[i]));
    }
    return new ErrorConstructor(message);
  };
}

上面一段代码用到的输出toDebugString和序列化对象serializeObject如下：

/* global: toDebugString: true */

function serializeObject(obj) {
  var seen = [];

  return JSON.stringify(obj, function(key, val) {
    val = toJsonReplacer(key, val);
    if (isObject(val)) {

      if (seen.indexOf(val) >= 0) return '<<already seen>>';

      seen.push(val);
    }
    return val;
  });
}

function toDebugString(obj) {
  if (typeof obj === 'function') {
    return obj.toString().replace(/ {[sS]*$/, '');
  } else if (typeof obj === 'undefined') {
    return 'undefined';
  } else if (typeof obj !== 'string') {
    return serializeObject(obj);
  }
  return obj;
}

二、

var lowercase = function(string) {return isString(string) ? string.toLowerCase() : string;};
var hasOwnProperty = Object.prototype.hasOwnProperty;
var uppercase = function(string) {return isString(string) ? string.toUpperCase() : string;};
var manualLowercase = function(s) {
　　/* jshint bitwise: false */
　　return isString(s) ? s.replace(/[A-Z]/g, function(ch) {return String.fromCharCode(ch.charCodeAt(0) | 32);}) : s;
};
var manualUppercase = function(s) {
　　/* jshint bitwise: false */
　　return isString(s) ? s.replace(/[a-z]/g, function(ch) {return String.fromCharCode(ch.charCodeAt(0) & ~32);}) : s;
};
　

　　if ('i' !== 'I'.toLowerCase()) {
　　　　lowercase = manualLowercase;
　　　　uppercase = manualUppercase;
　　}

三、 变量定义

var
    msie,             // holds major version number for IE, or NaN if UA is not IE.
    jqLite,           // delay binding since jQuery could be loaded after us.
    jQuery,           // delay binding
    slice             = [].slice,
    splice            = [].splice,
    push              = [].push,
    toString          = Object.prototype.toString,
    ngMinErr          = minErr('ng'),

    /** @name angular */
    angular           = window.angular || (window.angular = {}),
    angularModule,
    uid               = 0;

/**
 * documentMode is an IE-only property
 * http://msdn.microsoft.com/en-us/library/ie/cc196988(v=vs.85).aspx
 */
msie = document.documentMode;

四

function isArrayLike(obj) {
  if (obj == null || isWindow(obj)) {
    return false;
  }

  var length = obj.length;

  if (obj.nodeType === NODE_TYPE_ELEMENT && length) {
    return true;
  }

  return isString(obj) || isArray(obj) || length === 0 ||
         typeof length === 'number' && length > 0 && (length - 1) in obj;
}

五、遍历对象，对其中的属性执行遍历函数。还有序列化，以及序列化后的遍历

function forEach(obj, iterator, context) {
  var key, length;
  if (obj) {
    if (isFunction(obj)) {
      for (key in obj) {
        // Need to check if hasOwnProperty exists,
        // as on IE8 the result of querySelectorAll is an object without a hasOwnProperty function
        if (key != 'prototype' && key != 'length' && key != 'name' && (!obj.hasOwnProperty || obj.hasOwnProperty(key))) {
          iterator.call(context, obj[key], key, obj);
        }
      }
    } else if (isArray(obj) || isArrayLike(obj)) {
      var isPrimitive = typeof obj !== 'object';
      for (key = 0, length = obj.length; key < length; key++) {
        if (isPrimitive || key in obj) {
          iterator.call(context, obj[key], key, obj);
        }
      }
    } else if (obj.forEach && obj.forEach !== forEach) {
        obj.forEach(iterator, context, obj);
    } else {
      for (key in obj) {
        if (obj.hasOwnProperty(key)) {
          iterator.call(context, obj[key], key, obj);
        }
      }
    }
  }
  return obj;
}



function sortedKeys(obj) {
　　return Object.keys(obj).sort();
}


function forEachSorted(obj, iterator, context) {
　　var keys = sortedKeys(obj);
　　for (var i = 0; i < keys.length; i++) {
　　　　iterator.call(context, obj[keys[i]], keys[i]);
　　}
　　return keys;
}

六、 变化参数位置

function reverseParams(iteratorFn) {
  return function(value, key) { iteratorFn(key, value); };
}

七、 唯一id生成

function nextUid() {
  return ++uid;
}

八、设置对象的hashkey

function setHashKey(obj, h) {
  if (h) {
    obj.$$hashKey = h;
  }
  else {
    delete obj.$$hashKey;
  }
}

九、 给对象扩展属性，多个复制到一个

function extend(dst) {
  var h = dst.$$hashKey;

  for (var i = 1, ii = arguments.length; i < ii; i++) {
    var obj = arguments[i];
    if (obj) {
      var keys = Object.keys(obj);
      for (var j = 0, jj = keys.length; j < jj; j++) {
        var key = keys[j];
        dst[key] = obj[key];
      }
    }
  }

  setHashKey(dst, h);
  return dst;
}

十、转化为数字，和继承扩展

function int(str) {
  return parseInt(str, 10);
}


function inherit(parent, extra) {
  return extend(Object.create(parent), extra);
}

十一 空函数和函数的存值，并应用一个

function noop() {}
noop.$inject = [];

function identity($) {return $;}
identity.$inject = [];

十二、

function valueFn(value) {return function() {return value;};}

 十三、各种判断

function isUndefined(value) {return typeof value === 'undefined';}

function isDefined(value) {return typeof value !== 'undefined';}

function isObject(value) {
  // http://jsperf.com/isobject4
  return value !== null && typeof value === 'object';
}

function isString(value) {return typeof value === 'string';}

function isNumber(value) {return typeof value === 'number';}

function isDate(value) {
  return toString.call(value) === '[object Date]';
}

var isArray = Array.isArray;

function isFunction(value) {return typeof value === 'function';}

function isRegExp(value) {
  return toString.call(value) === '[object RegExp]';
}

unction isWindow(obj) {
  return obj && obj.window === obj;
}


function isScope(obj) {
  return obj && obj.$evalAsync && obj.$watch;
}


function isFile(obj) {
  return toString.call(obj) === '[object File]';
}


function isFormData(obj) {
  return toString.call(obj) === '[object FormData]';
}


function isBlob(obj) {
  return toString.call(obj) === '[object Blob]';
}


function isBoolean(value) {
  return typeof value === 'boolean';
}

function isPromiseLike(obj) {
  return obj && isFunction(obj.then);
}

十四、

var trim = function(value) {
  return isString(value) ? value.trim() : value;
};
　　var escapeForRegexp = function(s) {
　　　　return s.replace(/([-()[]{}+?*.$^|,:#<!\])/g, '\$1').replace(/x08/g, '\x08');
　　};